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Discussion Starter · #1 ·
2004 DII.

I realize there are a bunch of post on these codes.

But....
I have replaced the Bank A (passenger side), upstream o2 sensor like 3 times.
Note (1 year warranty - I have only PAID for one).

Anyway, these codes went away for a good while between replacing it the 2nd and 3rd (today) times.

However the codes are back.

Any thoughts, other than replace the sensor?
 

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587 Posts
Discussion Starter · #2 ·
Sensor or wiring or vacuum leak or other?

2004 DII 105K.

Repeating error codes:
P0130
P0171
P1171

I have replace the upstream, bank A (passenger side) o2 senser at least 3 times and these same codes keep coming back.

I even took it to a "reputable" shop - hung out with the tech as he put a scanner on the truck and found the o2 sensor's volts were not oscillating the way they should, so we replaced the sensor and 20 miles later SES light back on.

What's next?
 

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Oil leaks?... Valve cover gasket and or other oil. Leaks contaminating the connector is common. Worth a check
 
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